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| |
| import QtQuick 2.2 |
| |
| Item { |
| // This enum is actually keyboard-related, but it serves its purpose |
| // as an indication of direction for us. |
| property int direction: Qt.LeftArrow |
| property bool on: false |
| |
| property bool flashing: false |
| |
| scale: direction === Qt.LeftArrow ? 1 : -1 |
| //! [1] |
| Timer { |
| id: flashTimer |
| interval: 500 |
| running: on |
| repeat: true |
| onTriggered: flashing = !flashing |
| } |
| //! [1] |
| //! [2] |
| function paintOutlinePath(ctx) { |
| ctx.beginPath(); |
| ctx.moveTo(0, height * 0.5); |
| ctx.lineTo(0.6 * width, 0); |
| ctx.lineTo(0.6 * width, height * 0.28); |
| ctx.lineTo(width, height * 0.28); |
| ctx.lineTo(width, height * 0.72); |
| ctx.lineTo(0.6 * width, height * 0.72); |
| ctx.lineTo(0.6 * width, height); |
| ctx.lineTo(0, height * 0.5); |
| } |
| //! [2] |
| Canvas { |
| id: backgroundCanvas |
| anchors.fill: parent |
| |
| onPaint: { |
| var ctx = getContext("2d"); |
| ctx.reset(); |
| |
| paintOutlinePath(ctx); |
| |
| ctx.lineWidth = 1; |
| ctx.strokeStyle = "black"; |
| ctx.stroke(); |
| } |
| } |
| //! [3] |
| Canvas { |
| id: foregroundCanvas |
| anchors.fill: parent |
| visible: on && flashing |
| |
| onPaint: { |
| var ctx = getContext("2d"); |
| ctx.reset(); |
| |
| paintOutlinePath(ctx); |
| |
| ctx.fillStyle = "green"; |
| ctx.fill(); |
| } |
| } |
| //! [3] |
| } |